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SVT Shelby GT500
just installed 315/35/20 tires. Is the speedo off or not?
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<blockquote data-quote="Catmonkey" data-source="post: 12794961" data-attributes="member: 124025"><p>You can't use the unloaded diameter to make that calculation and expect accurate results. The radius under load compresses the unloaded radius by approximately 3%. Michelin's specs 726 revolutions per mile. Most manufacturers publish these specs. Check their websites. I didn't just pull 726 out my azz. <a href="http://www.michelinman.com/tire-selector/category/ultra-high-performance-sport/pilot-super-sport/tire-details#techspec_table" target="_blank">Michelin Pilot SS Specs</a></p></blockquote><p></p>
[QUOTE="Catmonkey, post: 12794961, member: 124025"] You can't use the unloaded diameter to make that calculation and expect accurate results. The radius under load compresses the unloaded radius by approximately 3%. Michelin's specs 726 revolutions per mile. Most manufacturers publish these specs. Check their websites. I didn't just pull 726 out my azz. [URL="http://www.michelinman.com/tire-selector/category/ultra-high-performance-sport/pilot-super-sport/tire-details#techspec_table"]Michelin Pilot SS Specs[/URL] [/QUOTE]
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SVT Shelby GT500
just installed 315/35/20 tires. Is the speedo off or not?
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